CN112670436A - Preparation method of battery pole piece - Google Patents
Preparation method of battery pole piece Download PDFInfo
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- CN112670436A CN112670436A CN202011494709.3A CN202011494709A CN112670436A CN 112670436 A CN112670436 A CN 112670436A CN 202011494709 A CN202011494709 A CN 202011494709A CN 112670436 A CN112670436 A CN 112670436A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention relates to a preparation method of a battery pole piece, which comprises the following steps: coating an active material layer on a current collector; removing part of the active material layer to form a plurality of first empty foil areas distributed at intervals in the width direction of the current collector on the current collector; cutting the current collector along the length direction of the current collector by a multi-cutter device to cut off the edge part of a first empty foil area, cutting the current collector coated with an active material layer into a plurality of pole piece materials while cutting off the edge part of the first empty foil area, wherein the remaining part of the cut edge part of the first empty foil area forms a pole lug welding area for welding a pole lug, and the first surface of each pole piece material is provided with one pole lug welding area in the width direction of the first surface. The current collector is cut through the multi-cutter device, the purpose of cutting to obtain a plurality of pole piece materials is achieved, meanwhile, a pole lug welding area which does not need to be machined again is formed in each pole piece material, the process is simple, the production efficiency is high, a plurality of cleaning devices do not need to be purchased, and the cost is low.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a preparation method of a battery pole piece.
Background
With the wide application of lithium ion batteries in electronic devices such as mobile phones and notebook computers, the market demand of the lithium ion batteries is increasing, and the performance requirements of the lithium ion batteries are also increasing at present, so the preparation process of the battery pole piece with high energy density, fast charge and fast discharge, low impedance and high manufacturing speed is the most urgent requirement of the current market, as shown in fig. 1 and fig. 2, the traditional pole piece process usually coats a plurality of active material areas on a current collector 1 at intervals, and the pole lugs 4 are welded at the intervals 2 'of the active material areas (namely, the pole lugs are welded at the empty foil areas close to the ends of the active material areas after being cut into pole piece monomers), the pole piece prepared by the preparation method has low energy density and high impedance, cannot well meet the requirements of fast charge and fast discharge, is easy to heat up the pole piece during charging, thereby causing danger, and because the pole lugs are welded at the intervals 2' of the active material areas, therefore, a large space is required to be reserved when the pole piece is prepared, the current collector 1 cannot be well utilized, and material waste is caused.
On the basis of the traditional pole piece process, as shown in fig. 3, the position of the pole lug is moved to the middle of the active material layer to form an embedded pole lug position, so that the aims of improving high energy density, realizing quick charge and quick discharge and reducing resistance can be fulfilled. However, the production process of the existing pole piece embedded with the pole lug mainly comprises the following steps: as shown in fig. 3, a pre-slitting mother roll a of a large roll is obtained, the pre-slitting mother roll a is slit to obtain a plurality of small roll pole pieces b, then welding empty foil areas 1 'for welding pole lugs are cleaned on the small roll pole pieces b through cleaning equipment, each cleaning equipment only cleans one small roll pole piece b, and finally pole lugs are welded on the welding empty foil areas 1'; in the process method, one cleaning device can only clean one small roll of pole piece b at the same time, the production efficiency is low, and meanwhile, in order to ensure the production progress, a plurality of cleaning devices are required to be purchased, so that the production cost is increased.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problem of low production efficiency when the pole piece with the embedded pole lug is prepared by the conventional pole piece preparation process, the preparation method of the battery pole piece is provided.
In order to solve the technical problem, an embodiment of the present invention provides a method for preparing a battery pole piece, including: coating an active material layer on a current collector;
removing part of the active material layer to form a plurality of first empty foil areas distributed at intervals in the width direction of the current collector on the current collector;
cutting the current collector along the length direction of the current collector by a multi-cutter device to cut off the edge part of the first empty foil area, and cutting the current collector coated with the active material layer into a plurality of pole pieces while cutting off the edge part of the first empty foil area, wherein the remaining part of the first empty foil area after the edge part is cut off forms a pole tab welding area for welding a pole tab, and the first surface of each pole piece is provided with one pole tab welding area in the width direction of the first surface.
Optionally, the multi-cutter apparatus includes a plurality of double-cutter sets, and the double-cutter sets are arranged along a width direction of the current collector;
the double-cutter set comprises a first cutter and a second cutter, the distance between the first cutter and the second cutter is the width of the pole sheet material, the first cutter is used for cutting off the edge part of the first empty foil area, and the first cutter and the second cutter are matched to cut off one pole sheet material;
and the adjacent double cutter sets are matched to cut off redundant leftover materials, and the width of the leftover materials is the distance between the adjacent double cutter sets.
Optionally, after removing part of the active material layer to form a plurality of first empty foil regions distributed at intervals in the width direction of the current collector on the current collector, the battery pole piece preparation method further includes rolling the current collector coated with the active material layer.
Optionally, the coating an active material layer on a current collector and the removing a portion of the active material layer to form a plurality of first empty foil regions on the current collector at intervals in a width direction of the current collector specifically include: presetting a first tab position on a first surface of a current collector;
adhering a first pressure removal layer to the position of the first tab, wherein the first pressure removal layer can fall off from the current collector when a certain pressure is applied to the first pressure removal layer;
coating a first side of the current collector with an active material layer and the active material layer is coated on the upper surface of the first pressure removal layer;
applying pressure to the first pressure removal layer coated with the active material layer to enable the first pressure removal layer to fall off the current collector, so that a first empty foil area which is used for welding a tab and not covered by the active material layer is formed on the first surface of the current collector.
Optionally, the first pressure-removing layer is made of pressure-sensitive adhesive paper.
Optionally, the applying pressure to the first pressure removal layer coated with the active material layer to peel the first pressure removal layer off the current collector specifically includes: pressing the pressure-sensitive adhesive paper by a pressure device, so that the pressure-sensitive adhesive paper is rolled up after being pressed to form a peelable adhesive paper sheet;
and removing the rolled pressure-sensitive adhesive paper from the current collector.
Optionally, before applying the pressure to the first pressure removal layer coated with the active material layer, heating the current collector coated with the active material layer to solidify the active material layer is further included.
Optionally, after the applying pressure to the first pressure removal layer coated with the active material layer makes the first pressure removal layer fall off the current collector, presetting a second tab position on the second surface of the current collector, wherein the second tab position is aligned with the first tab position;
sticking a second pressure removal layer on the position of the second tab;
coating an active material layer on the second surface of the current collector and coating the active material layer on the upper surface of the second pressure removal layer;
applying pressure to the second pressure removal layer coated with the active material layer to peel the second pressure removal layer off the current collector to form a second empty foil area on the second surface of the current collector, wherein the second empty foil area is not covered by the active material layer, so that the two surfaces of the current collector are coated with the active material layer and have the first empty foil area and the second empty foil area.
Optionally, the removing a portion of the active material layer to form a plurality of first empty foil regions on the current collector, the first empty foil regions being distributed at intervals in a width direction of the current collector specifically includes: and removing part of the active material layer by means of laser cleaning to form a plurality of first empty foil areas distributed at intervals in the width direction of the current collector on the current collector.
Optionally, the removing a portion of the active material layer to form a plurality of first empty foil regions on the current collector, the first empty foil regions being distributed at intervals in a width direction of the current collector specifically includes: presetting a third tab position on the first surface of the current collector;
spraying a cleaning agent on the active material layer at the position of the third tab to soften the active material layer;
removing the softened active material layer by a doctor blade to obtain the first empty foil region.
The method for preparing the battery pole piece provided by the embodiment of the invention comprises the steps of forming a plurality of first hollow foil areas distributed at intervals along the width direction of a current collector on the current collector coated with an active substance layer, cutting the current collector along the length direction of the current collector by a multi-cutter device to cut off the edge part of the first hollow foil areas, cutting the current collector coated with the active substance layer into a plurality of pole piece materials while cutting off the edge part of the first hollow foil areas, wherein the residual part of the edge part of the first hollow foil areas after being cut off forms a pole lug welding area for welding a pole lug, a first surface of each pole piece material is provided with one pole lug welding area in the width direction of the first surface, and the cutting mode not only removes the edge part of the first hollow foil areas but also realizes the cutting of a large current collector into a plurality of pole piece materials with pole lug welding areas when cutting the current collector, cut the mass flow body through many cutters equipment promptly and both realized cutting the purpose that obtains a plurality of utmost point sheet stocks, also make simultaneously have the utmost point ear welding area that need not reprocess on each utmost point sheet stock, compare with prior art, can obtain required pole piece material after cutting, the process is simpler, and production efficiency is fast to need not to purchase many cleaning equipment, it is with low costs.
Drawings
FIG. 1 is a schematic diagram of a conventional pole piece;
FIG. 2 is a schematic diagram of another view of the conventional pole piece of FIG. 1;
fig. 3 is a state diagram of raw material molding in each stage when the tab embedded pole piece is manufactured by the existing manufacturing process;
fig. 4 is a schematic structural diagram of a current collector formed with a first empty foil region and a second empty foil region according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a current collector at the slitting stage according to an embodiment of the present invention;
fig. 6 is a schematic structural view of a tab embedded pole piece manufactured by the method for manufacturing a battery pole piece according to an embodiment of the present invention, when a tab is not welded;
fig. 7 is a schematic structural view of a tab embedded pole piece manufactured by the method for manufacturing a battery pole piece according to an embodiment of the present invention, and the tab is welded to the pole piece.
The reference numerals in the specification are as follows:
1', welding a hollow foil area; 2', the spacing of the active material regions; a. cutting the front mother roll; b. winding the pole piece in a small roll;
1. a current collector;
2. extremely sheet materials;
3. an active material layer;
4. a tab;
5. a first empty foil region; 51. a tab welding area;
6. a second empty foil region;
7a, a first tangent line; 7b, a second tangent line; 7c, a third tangent line; 7d, fourth tangent line.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The preparation method of the battery pole piece provided by the embodiment of the invention, as shown in fig. 4-7, comprises the following steps:
s10: coating an active material layer 3 on a current collector 1;
s20: removing part of the active material layer 3 to form a plurality of first empty foil regions 5 on the current collector 1 at intervals in the width direction of the current collector 1;
s30: cutting the current collector 1 along the length direction of the current collector 1 by a multi-cutter apparatus to cut off the edge portion of the first vacant foil area 5, and cutting the current collector 1 coated with the active material layer 3 into a plurality of pole sheet materials 2 while cutting off the edge portion of the first vacant foil area 5, the remaining portion after the edge portion of the first vacant foil area 5 is cut off forming a pole tab welding area 51 for welding a pole tab 4, a first face of each of the pole sheet materials 2 having one of the pole tab welding areas 51 in its own width direction.
S40: a tab 4 is welded to the tab welding region 51.
The method for preparing the battery pole piece provided by the embodiment of the invention comprises the steps of forming a plurality of first hollow foil areas 5 which are distributed at intervals along the width direction of a current collector 1 on the current collector 1 coated with an active substance layer 3, cutting the current collector 1 along the length direction of the current collector 1 by a multi-cutter device to cut off the edge part of the first hollow foil areas 5, cutting the current collector 1 coated with the active substance layer 3 into a plurality of pole piece materials 2 while cutting off the edge part of the first hollow foil areas 5, forming a pole lug welding area 51 for welding a pole lug 4 by the residual part after cutting off the edge part of the first hollow foil areas 5, wherein the first surface of each pole piece material 2 is provided with one pole lug welding area 51 in the width direction of the first surface, and the cutting mode not only removes the edge part of the first hollow foil areas 5 but also realizes that the current collector 1 of the pole piece is cut into a plurality of large pole piece materials 2 with the pole lug welding areas 51 when the current collector 1 is cut, namely, the current collector 1 is cut by a multi-cutter device, so that the purpose of cutting to obtain a plurality of pole pieces 2 is achieved, and a pole lug welding area 51 which is not required to be processed again is arranged on each pole piece 2, compared with the prior art (in the prior art, a mother coil a before cutting is cut to obtain a plurality of small coil pole pieces b, the pole lug welding area for welding the pole lug 4 is cleaned on the small coil pole pieces b by cleaning equipment, only one small coil pole piece b is cleaned by each cleaning equipment; in the prior art, the process method is used for cutting the mother coil a before cutting and then cleaning the pole lug welding area, one cleaning equipment can only clean one small coil pole piece b at the same time, the production efficiency is low), the required pole piece materials 2 can be obtained after cutting, the process is simpler, the production efficiency is high, and a plurality of cleaning equipment does not need to be purchased, the cost is low.
In one embodiment, the multi-cutter apparatus includes a plurality of double-cutter sets, and the double-cutter sets are arranged along the width direction of the current collector 1;
the double-cutter set comprises a first cutter and a second cutter, the distance between the first cutter and the second cutter is the width of the pole sheet material 2, the first cutter is used for cutting off the edge part of the first empty foil area 5, and the first cutter and the second cutter are matched to cut off one pole sheet material 2;
and the adjacent double cutter sets are matched to cut off redundant leftover materials, and the width of the leftover materials is the distance between the adjacent double cutter sets. The current collector 1 is cut by a plurality of double-knife components, so that the purpose of cutting a plurality of pole pieces 2 is achieved, each pole piece 2 is provided with a pole lug welding area 51 which is not required to be processed again, and the production efficiency is high.
For example, as shown in fig. 5, the two sets of double knives are arranged, the first empty foil area 5 is arranged in two sets, the first cutting knife of the first set of double knives cuts along the first cutting line 7a, the first cutting line 7a cuts along the length direction of the current collector 1 and passes through the first empty foil area 5, so that the first cutting knife of the first set of double knives can cut off the edge part of the first empty foil area 5, the second cutting knife of the first set of double knives cuts along the second cutting line 7b, the second cutting line 7b passes through the first empty foil area and the second empty foil area along the length direction of the current collector 1, the distance a between the first cutting line 7a and the second cutting line 7b is the width of the pole piece, the first cutting knife of the second set of double knives cuts along the third cutting line 7c, the third cutting line 7c cuts along the length direction of the current collector 1 and passes through the second first empty foil area 5, the first cutter of the second group of double-cutter sets can cut off the edge part of the second first empty foil area 5, the second cutter of the second group of double-cutter sets cuts along the fourth tangent line 7d, the fourth tangent line 7d has a certain distance with the second empty foil area along the length direction of the current collector 1, the distance A between the third tangent line 7c and the fourth tangent line 7d is the width of the pole piece, the piece material between the second tangent line 7b and the third tangent line 7c is used as redundant leftover material and is scrapped, and the distance between the second tangent line 7b and the third tangent line 7c (namely the distance between the adjacent double-cutter sets) is the width of the leftover material. The cut pole piece having the tab welding area 51 is shown in fig. 6, and finally the tab 4 is welded to the tab welding area 51 (shown in fig. 7).
If a plurality of first empty foil areas 5 are also arranged on the length of the current collector 1, the current collector 1 needs to be cut along the direction perpendicular to the width direction of the current collector, so that the first surface of the finally manufactured pole piece only has one pole lug welding area 51, the specific position of cutting the current collector 1 along the direction perpendicular to the width direction of the current collector is arranged according to the length of the pole piece material to be cut, and therefore the cut pole piece material meets the length requirement, and the distance between the first empty foil areas 5 in the length direction of the current collector depends on the length requirement of the pole piece material to be manufactured.
In an embodiment, after step S20, that is, after the removing of part of active material layer 3 to form a plurality of first empty foil regions 5 on current collector 1 at intervals along the width direction of current collector 1, the method for preparing a battery pole piece further includes step S50: the current collector 1 coated with the active material layer 3 is subjected to roll pressing. The thickness of the current collector coated with the active material layer may be rolled to a desired process thickness by rolling.
In an embodiment, the step S10 and the step S20 specifically include that the step of coating the active material layer 3 on the current collector 1 and the step of removing part of the active material layer 3 to form a plurality of first empty foil regions 5 spaced apart in the width direction of the current collector 1 on the current collector 1 specifically includes: step S11: a first tab position is preset on the first surface of the current collector 1.
S12: paste first pressure and remove the layer on first utmost point ear position, wherein, right when first pressure is removed the layer and is exerted certain pressure first pressure is removed the layer and can be followed it drops to collect body 1.
S13: an active material layer 3 is coated on a first surface of the current collector 1 and the active material layer 3 is coated on an upper surface of the first pressure-removal layer. When the manufactured pole piece is a positive pole piece, the active material layer 3 comprises lithium cobaltate, glue solution, conductive agent and solvent, wherein the lithium cobaltate can be replaced by lithium iron phosphate, lithium manganate or ternary materials, the glue solution can be PVDF (polyvinylidene fluoride) glue solution, the conductive agent can be carbon, and the solvent can be NMP (N-methyl pyrrolidone);
when the manufactured pole piece is a negative pole piece, the active material layer 3 includes graphite (wherein, graphite can also be replaced by silicon, silicon oxide, lithium titanate or other metal oxide negative pole active materials), a conductive agent, glue solution and a solvent, wherein, the conductive agent can adopt carbon, the glue solution can adopt CMC (sodium carboxymethylcellulose), and the solvent can adopt water. Preferably, the first surface of the current collector 1 and the first pressure removal layer may be coated by a coater, so that the coating efficiency is improved.
S14: applying pressure to the first pressure-removal layer coated with the active material layer 3 causes the first pressure-removal layer to be detached from the current collector 1, thereby forming a first empty foil region 5 for a welding tab 4 on the first surface of the current collector 1, which is not covered by the active material layer 3.
Wherein, the first pressure removing layer adopts pressure sensitive adhesive paper.
Specifically, the step S14 specifically includes that the applying pressure to the first pressure removal layer coated with the active material layer 3 to peel the first pressure removal layer off the current collector 1 specifically includes: step S141: and (3) performing adhesive pressing action on the pressure-sensitive adhesive paper through a pressure device, so that the pressure-sensitive adhesive paper is rolled up after being pressed to form a peelable adhesive paper sheet. The first empty foil area which is used for welding the tab and is not covered by the active substance layer is formed on the first surface of the current collector by applying a pressure to remove the first pressure removal layer, so that the manufacturing process is simple, the operation is easy, and the cost is low. Preferably, the pressure range of the pressure device is 500-3000N, and the rolling effect of the first pressure removal layer is better.
S142: and removing the rolled pressure-sensitive adhesive paper from the current collector 1.
In one embodiment, before step S14, that is, before applying pressure to the first pressure removal layer coated with the active material layer 3, step S15 is further included: the current collector 1 coated with the active material layer 3 is heated to solidify the active material layer 3. The heating temperature is mainly dependent on the material of active material layer 3, and is specifically selected according to the material of active material layer 3.
Preferably, the current collector 1 coated with the active material layer 3 is heated by an oven, and it should be noted that, during the heating process, the first pressure removing layer is not foamed, rolled and expanded, and after the baking process is finished, the first pressure removing layer is pressed by a pressing device, so that the first pressure removing layer is rolled after being pressed to form a peelable adhesive paper sheet.
In an embodiment, after step S14, that is, after the applying pressure to the first pressure removal layer coated with the active material layer 3 makes the first pressure removal layer peel off from the current collector 1, step S16 is further included: and presetting a second tab position on the second surface of the current collector 1, wherein the second tab position is aligned with the first tab position.
Step S17: and sticking a second pressure removal layer on the position of the second tab.
Step S18: an active material layer 3 is coated on the second surface of the current collector 1 and the active material layer 3 is coated on the upper surface of the second pressure-removal layer.
Step S19: applying pressure to the second pressure-removal layer coated with the active material layer 3 causes the second pressure-removal layer to peel off from the current collector 1 to form a second empty foil area 6 on the second surface of the current collector 1, which is not covered with the active material layer 3, so that both surfaces of the current collector 1 are coated with the active material layer 3 and have the first empty foil area 5 and the second empty foil area 6 (as shown in fig. 4). After removing the first pressure removal layer of the first surface of the current collector, forming a second empty foil area 6 on the second surface of the current collector in the same way, so that the problem that the thickness of a lug position (a first lug position and a second lug position) is too thick due to the fact that the first pressure removal layer and the second pressure removal layer are arranged on the two surfaces of the current collector at the same time can be avoided, and the problem that coating cannot be carried out can be caused when the thickness is larger than the coating distance.
The specific manner of coating the active material layer 3 and forming the second empty foil area 6 on the second surface of the current collector 1 is the same as the specific manner of coating the active material layer 3 and forming the first empty foil area on the first surface of the current collector 1.
Wherein, in addition to the manner of cooperating with the pressure sensitive adhesive by the pressure device, the manner of forming the first empty foil area 5 and the second empty foil area 6 may also be the manner of laser cleaning, in an embodiment, the step S20 specifically includes that the removing part of the active material layer 3 to form a plurality of first empty foil areas 5 spaced apart along the width direction of the current collector 1 on the current collector 1 specifically includes: and removing part of the active material layer 3 by means of laser cleaning to form a plurality of first empty foil areas 5 distributed at intervals in the width direction of the current collector 1 on the current collector 1. According to the process requirements, firstly, a small-power laser is adopted to primarily clean a specific area at a fixed position, so that surface substances are cleaned out, then, the power of the laser is increased, the specific area is thoroughly cleaned, and finally, a first empty foil area 5 is obtained on the first surface of the current collector coated with an active substance layer; and finally obtaining a second empty foil area 6 on the second surface at the same position of the second surface of the current collector coated with the active material layer in a manner consistent with the cleaning manner of the first surface, wherein after the cleaning is finished, the first surface is overlapped with the first empty foil area 5 and the second empty foil area 6 of the second surface in areas with the same length and width.
Forming the first and second empty foil areas 5 and 6 may also be performed by scraping with a scraper, in an embodiment, the step S20 specifically includes, in part, removing the active material layer 3 to form a plurality of first empty foil areas 5 spaced apart along the width direction of the current collector 1 on the current collector 1, specifically including: step S21: and presetting a third tab position on the first surface of the current collector 1.
Step S22: a cleaning agent is sprayed on the active material layer 3 at the position of the third tab to soften the active material layer 3.
Step S23: the softened active substance layer 3 is removed by means of a doctor blade so that the first free foil region 5 is obtained.
Step S24: and presetting a fourth tab position on the second surface of the current collector 1.
Step S25: a cleaning agent is sprayed on the active material layer 3 at the fourth tab position to soften the active material layer 3.
Step S26: the softened active substance layer 3 at the fourth lug position is removed by means of a spatula so that a second free foil region results. The cleaning agent may be an NMP solvent (N-methylpyrrolidone solvent).
Preferably, because the doctor blade technology has the requirement to the roughness, in scraping the in-process, need special attention, the regional area of scraping of the first face of mass flow body 1 will be greater than the area of scraping of the second face of mass flow body 1, take welding 6 mm's utmost point ear as an example, the width of scraping of the first face of mass flow body 1 is 12mm, and the width of scraping of the second face of mass flow body 1 is 10 mm.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A preparation method of a battery pole piece is characterized by comprising the following steps:
coating an active material layer on a current collector;
removing part of the active material layer to form a plurality of first empty foil areas distributed at intervals in the width direction of the current collector on the current collector;
cutting the current collector along the length direction of the current collector by a multi-cutter device to cut off the edge part of the first empty foil area, and cutting the current collector coated with the active material layer into a plurality of pole pieces while cutting off the edge part of the first empty foil area, wherein the remaining part of the first empty foil area after the edge part is cut off forms a pole tab welding area for welding a pole tab, and the first surface of each pole piece is provided with one pole tab welding area in the width direction of the first surface.
2. The battery pole piece preparation method of claim 1, wherein the multi-cutter device comprises a plurality of double cutter sets, and the double cutter sets are arranged along the width direction of the current collector;
the double-cutter set comprises a first cutter and a second cutter, the distance between the first cutter and the second cutter is the width of the pole sheet material, the first cutter is used for cutting off the edge part of the first empty foil area, and the first cutter and the second cutter are matched to cut off one pole sheet material;
and the adjacent double cutter sets are matched to cut off redundant leftover materials, and the width of the leftover materials is the distance between the adjacent double cutter sets.
3. The method for preparing a battery pole piece according to claim 1, wherein after removing part of the active material layer to form a plurality of first empty foil regions on the current collector at intervals in the width direction of the current collector, the method for preparing a battery pole piece further comprises rolling the current collector coated with the active material layer.
4. The method for preparing the battery pole piece according to claim 1, wherein the step of coating an active material layer on a current collector and the step of removing part of the active material layer to form a plurality of first empty foil areas distributed at intervals in the width direction of the current collector on the current collector specifically comprises the steps of: presetting a first tab position on a first surface of a current collector;
adhering a first pressure removal layer to the position of the first tab, wherein the first pressure removal layer can fall off from the current collector when a certain pressure is applied to the first pressure removal layer;
coating a first side of the current collector with an active material layer and the active material layer is coated on the upper surface of the first pressure removal layer;
applying pressure to the first pressure removal layer coated with the active material layer to enable the first pressure removal layer to fall off the current collector, so that a first empty foil area which is used for welding a tab and not covered by the active material layer is formed on the first surface of the current collector.
5. The method for preparing the battery pole piece according to claim 4, wherein the first pressure removing layer is made of pressure-sensitive adhesive paper.
6. The method for preparing the battery pole piece according to claim 5, wherein the applying pressure to the first pressure removal layer coated with the active material layer to make the first pressure removal layer fall off the current collector specifically comprises: pressing the pressure-sensitive adhesive paper by a pressure device, so that the pressure-sensitive adhesive paper is rolled up after being pressed to form a peelable adhesive paper sheet;
and removing the rolled pressure-sensitive adhesive paper from the current collector.
7. The battery pole piece manufacturing method according to claim 4, further comprising heating the current collector coated with the active material layer to solidify the active material layer before applying pressure to the first pressure removal layer coated with the active material layer.
8. The method for preparing the battery pole piece according to claim 4, further comprising presetting a second tab position on the second surface of the current collector after applying pressure to the first pressure removal layer coated with the active material layer to enable the first pressure removal layer to fall off the current collector, wherein the second tab position is aligned with the first tab position;
sticking a second pressure removal layer on the position of the second tab;
coating an active material layer on the second surface of the current collector and coating the active material layer on the upper surface of the second pressure removal layer;
applying pressure to the second pressure removal layer coated with the active material layer to peel the second pressure removal layer off the current collector to form a second empty foil area on the second surface of the current collector, wherein the second empty foil area is not covered by the active material layer, so that the two surfaces of the current collector are coated with the active material layer and have the first empty foil area and the second empty foil area.
9. The method for preparing a battery pole piece according to claim 1, wherein the removing of a part of the active material layer to form a plurality of first empty foil regions on the current collector at intervals in the width direction of the current collector specifically comprises: and removing part of the active material layer by means of laser cleaning to form a plurality of first empty foil areas distributed at intervals in the width direction of the current collector on the current collector.
10. The method for preparing a battery pole piece according to claim 1, wherein the removing of a part of the active material layer to form a plurality of first empty foil regions on the current collector at intervals in the width direction of the current collector specifically comprises: presetting a third tab position on the first surface of the current collector;
spraying a cleaning agent on the active material layer at the position of the third tab to soften the active material layer;
removing the softened active material layer by a doctor blade to obtain the first empty foil region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011494709.3A CN112670436A (en) | 2020-12-17 | 2020-12-17 | Preparation method of battery pole piece |
Applications Claiming Priority (1)
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114273341A (en) * | 2021-12-13 | 2022-04-05 | 深圳市凌云视迅科技有限责任公司 | Pole piece double-face cleaning and positioning method and device |
| CN114300751A (en) * | 2021-12-15 | 2022-04-08 | 惠州锂威新能源科技有限公司 | Multi-electrode ear lithium ion battery and preparation method thereof |
| CN115020650A (en) * | 2022-08-05 | 2022-09-06 | 比亚迪股份有限公司 | Preparation method of battery pole piece, battery pole piece and battery |
| CN115513403A (en) * | 2022-09-02 | 2022-12-23 | 惠州锂威新能源科技有限公司 | Pole piece manufacturing method, pole piece and single battery |
| WO2023245693A1 (en) * | 2022-06-23 | 2023-12-28 | 天津聚元新能源科技有限公司 | Pole piece manufacturing method for lithium ion battery with embedded tab structure |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104259143A (en) * | 2014-08-25 | 2015-01-07 | 曹国柱 | Method for cleaning rubber rollers |
| CN204156007U (en) * | 2014-10-13 | 2015-02-11 | 陕西德飞新能源科技有限公司大荔分公司 | A kind of moviemaking system of anode of nickel-metal hydride battery |
| CN105261781A (en) * | 2015-10-28 | 2016-01-20 | 广东烛光新能源科技有限公司 | Electrochemical cell and preparation method thereof |
| KR20160009840A (en) * | 2014-07-17 | 2016-01-27 | 주식회사 엘지화학 | Electrode and electrode coating device manufacturing the same |
| CN105742565A (en) * | 2016-02-29 | 2016-07-06 | 宁德新能源科技有限公司 | Lithium ion battery pole plate and preparation method thereof |
| CN106159206A (en) * | 2015-04-13 | 2016-11-23 | 宁德新能源科技有限公司 | Method for preparing lithium ion battery pole pieces |
| CN107346831A (en) * | 2016-05-04 | 2017-11-14 | 上海奇谋能源技术开发有限公司 | A kind of method for improving lithium ion battery service life |
| CN109575852A (en) * | 2018-12-15 | 2019-04-05 | 深圳市益达兴科技股份有限公司 | Removable development of Acrylate Emulsion Pressure-Sensitive Adhesive containing organosilicon cross-linking agent and preparation method thereof |
| CN111668444A (en) * | 2020-05-22 | 2020-09-15 | 惠州锂威新能源科技有限公司 | Preparation method of multi-tab battery cell and multi-tab battery cell |
-
2020
- 2020-12-17 CN CN202011494709.3A patent/CN112670436A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160009840A (en) * | 2014-07-17 | 2016-01-27 | 주식회사 엘지화학 | Electrode and electrode coating device manufacturing the same |
| CN104259143A (en) * | 2014-08-25 | 2015-01-07 | 曹国柱 | Method for cleaning rubber rollers |
| CN204156007U (en) * | 2014-10-13 | 2015-02-11 | 陕西德飞新能源科技有限公司大荔分公司 | A kind of moviemaking system of anode of nickel-metal hydride battery |
| CN106159206A (en) * | 2015-04-13 | 2016-11-23 | 宁德新能源科技有限公司 | Method for preparing lithium ion battery pole pieces |
| CN105261781A (en) * | 2015-10-28 | 2016-01-20 | 广东烛光新能源科技有限公司 | Electrochemical cell and preparation method thereof |
| CN105742565A (en) * | 2016-02-29 | 2016-07-06 | 宁德新能源科技有限公司 | Lithium ion battery pole plate and preparation method thereof |
| CN107346831A (en) * | 2016-05-04 | 2017-11-14 | 上海奇谋能源技术开发有限公司 | A kind of method for improving lithium ion battery service life |
| CN109575852A (en) * | 2018-12-15 | 2019-04-05 | 深圳市益达兴科技股份有限公司 | Removable development of Acrylate Emulsion Pressure-Sensitive Adhesive containing organosilicon cross-linking agent and preparation method thereof |
| CN111668444A (en) * | 2020-05-22 | 2020-09-15 | 惠州锂威新能源科技有限公司 | Preparation method of multi-tab battery cell and multi-tab battery cell |
Non-Patent Citations (1)
| Title |
|---|
| 郭斌等: "用于粘贴ABS/HIPS/PMMA的压敏胶粘贴性能研究", 《粘结》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114273341A (en) * | 2021-12-13 | 2022-04-05 | 深圳市凌云视迅科技有限责任公司 | Pole piece double-face cleaning and positioning method and device |
| CN114273341B (en) * | 2021-12-13 | 2022-09-30 | 深圳市凌云视迅科技有限责任公司 | Pole piece double-face cleaning and positioning method and device |
| CN114300751A (en) * | 2021-12-15 | 2022-04-08 | 惠州锂威新能源科技有限公司 | Multi-electrode ear lithium ion battery and preparation method thereof |
| WO2023245693A1 (en) * | 2022-06-23 | 2023-12-28 | 天津聚元新能源科技有限公司 | Pole piece manufacturing method for lithium ion battery with embedded tab structure |
| CN115020650A (en) * | 2022-08-05 | 2022-09-06 | 比亚迪股份有限公司 | Preparation method of battery pole piece, battery pole piece and battery |
| CN115513403A (en) * | 2022-09-02 | 2022-12-23 | 惠州锂威新能源科技有限公司 | Pole piece manufacturing method, pole piece and single battery |
| WO2024067403A1 (en) * | 2022-09-29 | 2024-04-04 | 惠州市豪鹏科技有限公司 | Electrode plate and battery |
| WO2024074096A1 (en) * | 2022-10-08 | 2024-04-11 | 惠州市豪鹏科技有限公司 | Electrode sheet and battery |
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Application publication date: 20210416 |